TABLE 2.

Influence of the purification procedure used to isolate microglia cells on retroviral infectivity

Type of value	Macrophages	Macrophages with gradient centrifugationa	Macrophages with enzymatic digestion and gradient centrifugationb
Infectivity titerc	4.6 ± 0.2	4.5 ± 0.1	4.3 ± 0.1
No. of rats	6	6	3

^aPeritoneal macrophages were subjected to the microglia cell purification scheme without prior enzymatic digestion. 

^bPeritoneal macrophages were subjected to the microglia cell purification scheme with prior enzymatic digestion. 

^cTiters are expressed as log FFU per 10⁶ cells ± SE.